From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Graph plotting the variation of shackle angle against compression for a narrow pad with a 10° inward shackle.
| Identifier | ExFiles\Box 67a\1\ scan0220 | |
| Date | 27th May 1925 guessed | |
| (112) VARIATION OF SHACKLE ANGLE. Narrow Pad 10° Inward Shackle. YI SHACKLE ANGLE. 0° 10° 20° 30° 40° COMPRESSION INCHES 0 1 2 3 4 5 6 | ||